Is there any way to get a quick render, like OpenGL for cycles and fisheye camera?
override all the materials from the layer tab :



to add wireframe to all objects :

import bpy

for obj in bpy.data.objects:
    if obj.type == 'MESH':
        obj.modifiers.new("temp_mod", 'WIREFRAME')


run this and all the objects will be in wireframe render then use this script to remove it :

import bpy
for obj in bpy.data.objects:
    if obj.type == 'MESH':
        obj.modifiers.remove(obj.modifiers['temp_mod'])